The CAS Registry Mumber 129644-58-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,6,4 and 4 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 129644-58: (8*1)+(7*2)+(6*9)+(5*6)+(4*4)+(3*4)+(2*5)+(1*8)=152 152 % 10 = 2 So 129644-58-2 is a valid CAS Registry Number.
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